adv.,adj. 即席地[的]，临时地[的]，无准备地[的]。 an impromptu speech 即席演说。 speak impromptu即席演讲。 n. 即席之作；即席演说；即兴演奏。
without advance preparation; "he spoke ad lib" 同义词：ad lib, ad libitum, spontaneously, ad lib, ad libitum, spontaneously,
without advance preparation; "he spoke ad lib" 同义词：ad lib, ad libitum, spontaneously, ad lib, ad libitum, spontaneously,
with little or no preparation or forethought; "his ad-lib comments showed poor judgment"; "an extemporaneous piano recital"; "an extemporary lecture"; "an extempore skit"; "an impromptu speech"; "offhand excuses"; "trying to sound offhanded and reassuring"; "an off-the-cuff toast"; "a few unrehearsed comments" 同义词：ad-lib, extemporaneous, extemporary, extempore, offhand, offhanded, off-the-cuff, unrehearsed,
an extemporaneous speech or remark; "a witty impromptu must not sound premeditated"
a short musical passage that seems to have been made spontaneously without advance preparation
An impromptu (, , loosely meaning "offhand") is a free-form musical composition with the character of an ex tempore improvisation as if prompted by the spirit of the moment, usually for a solo instrument, such as piano. The first recorded use of the term impromptu in this sense occurred in 1817, in the Allgemeine musikalische Zeitung, an idea of the publisher to describe a piano piece by Jan Václav Vo?í?ek.
例句与用法
1.
He is good at making impromptu speeches . 他善于发表即席演说。
2.
His call for a book of the trains had been a sheer piece of impromptu . 他打听火车时刻表只是一段纯粹的即兴曲。
3.
But the fervid facility of his impromptus could not be so accounted for . 但是，如此解释他那高超的即兴演奏的技巧就不行了。
4.
I ought to have replied that it was not easy to give an impromptu answer to a question about appearances . 我应该回答说关于外貌问题要作一个即兴的回答是不容易的。
5.
In between appearances on tv and radio broadcasts, mr. fletcher holds an impromptu news conference . 在电视和电台播出的空隙之间，弗莱彻先生举行了一次临时记者招待会。
6.
He was outwardly decent and managed to keep his coolness, but inside he was impromptu and full of unexpectedness . 他外表仍旧很庄重，还能保持平静，但是内心却充满了意想不到的东西，一触即发。
7.
An impromptu visit broke up the long afternoon 突然的造访打破了漫长的午后时光
8.
Just getting scorched in an impromptu street race 在一场即兴的街头比赛中大败
9.
Just getting scorched in an impromptu street race 在一场即兴的街头比赛中大败
10.
Impromptu talk means a talk without preparation 即席发言是指没有事先准备的发言。
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